What is the relation between windowing and hopping in audio DSP

1. What is a hop in audio?
2. How do I choose a hop size?
3. What is FFT windowing?
4. What is the hop size?

What is a hop in audio?

Hop length is the length of the non-intersecting portion of window length. Overlap length is the length of the intersecting portion of the window length.

How do I choose a hop size?

Hop size should refer to the number of samples in between successive frames. For signal analysis Hop Size should be less than the frame size, so that frames overlap.

What is FFT windowing?

A window function provides a weighted selection of a portion of a time waveform for fast Fourier transform (FFT) analysis. It is generated by multiplying the original time waveform by a user-defined window function of some width. In this case, width equals two times the number of analysis lines.

What is the hop size?

The hop size (number of samples between each successive FFT window) of Fast Fourier transforms performed is equal to the size of the Fast Fourier transform divided by the overlap factor (e.g. if the frame size is 512 and the overlap is set to 2 then the hop size is 256 samples).